One of the most effective ways a person's memory and concentration abilities is to solve puzzles. Seamless jigsaw puzzles from BrainTreeGames are a challenging collection of 500 piece seamless puzzles for adults that test their cognitive abilities. BrainTreeGames uses a hexagonal-shaped collage of photos to create attractive sceneries in their assortment of the best seamless puzzles. Because it's a bit more challenging challenge, you'll need some fundamental problem-solving skills to complete this masterpiece. The color combination is lovely, and the small puzzles' exceptional build quality ensures that you won't have any problems putting them together. The puzzles are designed with customer pleasure in mind and every jigsaw piece has a thickness of 1.75 mm, and a bonus puzzle poster is included in the package.